GEODE-6022: Update linux image to use cmake 3.12.4 (#402)
GEODE-6022: Update linux image to use cmake 3.12.4 (#402)


pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native